Man, everyone has made really great points. Anything I say here is as someone who has lurked longer than been a member.
I actively started checking out PWO when the 1996 yearbook was getting underway. Checking in on a daily basis to see what everyone was saying, getting recommendations, etc. It was great watching each year get filled with more views, discussions and so on was awesome.
I really should have signed up back then but, my life circumstances at the time would have made it difficult. Nevertheless, I finally got on board and since I mainly watch older stuff and have like a 200 page long word doc of reviews, I'm all about sharing in the MDA yearbooks.
I feel the MDA now serves more as a reference source than a forum for discourse. The emphasis is more on Match Archive than Match Discussion... at least for everything pre 2015. I'm not sure newer folks even scroll down to check it anymore. They may just click straight to the main page or the current WWE forum.
The 90s yearbook sets that folks watched helped keep that discussion going and gave context and organization but, for the 1920s-80s & 2000s-2010s especially, its kinda the wild west. So, people may shy away from posting or create topics without a consistent format.
I think the best thing is to encourage people that create new topics in the MDA to tag the hell of it. Have a minimum or standardized tag "requirement." At least the names of the participants, any AKAs (if known), the promotion, belt/title defended, and specific tour/annual event name like Royal Rumble or G1 Climax. Hopefully, those things would provide some cross reference even if someone's spelling or spacing is off. Any topic on the main forums, the above but, add a year tag too.
IDK if any admin can add or edit tags retroactively but, I see topics in the MDA with no tags or with just a name or two. That bums me out a little...
Also, adding links or at least cross referencing other posts within your post is good practice that I don't see often enough anymore but, it helps synthesize the board as reference source and forum.
I don't know if you can or want to "enforce" the tagging but, folks may just need a little direction, guidance, or even reminder now & again. That way there's relatively consistent board organization and perhaps clearer research & discussion pathways.
I hope this helps